KR20170008358A - Organic light-emitting display device - Google Patents

Abstract

An organic light emitting display device is disclosed. The organic light emitting display device includes a first sub pixel, a second sub pixel, a third sub pixel, and a fourth sub pixel. The first sub pixel includes a first light emitting layer. The second sub pixel includes a second light emitting layer. The third sub pixel includes a third light emitting layer. The fourth sub pixel includes a fourth light emitting layer. At least one of the first, second, third, and fourth light emitting layers discharges delayed fluorescence. The organic light emitting display device has high color purity and low power consumption.

Description

[0001] The present invention relates to an organic light-

Embodiments of the present invention relate to an organic light emitting display.

Since the organic light emitting display has excellent characteristics in terms of viewing angle, contrast, response speed, power consumption, and the like, the range of applications from personal portable devices such as MP3 players and cellular phones to televisions is expanding.

Such an organic light emitting display device has self-emission characteristics, and unlike a liquid crystal display device, a separate light source is not required, so that thickness and weight can be reduced.

Embodiments of the present invention provide an organic light emitting display.

According to an embodiment of the present invention, there is provided a liquid crystal display device including a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel; ;

The first sub-pixel includes a first light emitting layer that emits a first color light, the second sub-pixel includes a second light emitting layer that emits a second color light, and the third sub-pixel emits a third color light Pixel includes a fourth light-emitting layer for emitting a fourth color light;

The first color light, the second color light, the third color light and the fourth color light are different from each other;

Wherein at least one of the light emitting layers of the first light emitting layer, the second light emitting layer, the third light emitting layer, and the fourth light emitting layer emits a delayed fluorescence.

The organic light emitting display device can exhibit characteristics of high color purity, low power consumption and long life.

1A is a plan view schematically illustrating the structure of one pixel of an organic light emitting display according to an embodiment of the present invention.
1B is a plan view schematically illustrating the structure of one pixel of an OLED display according to an exemplary embodiment of the present invention.
2 is a cross-sectional view schematically illustrating the structure of one pixel of an organic light emitting display according to an embodiment of the present invention.
3 is a plan view schematically showing the structure of one pixel of an OLED display according to another embodiment of the present invention.
4 is a plan view schematically illustrating the structure of one pixel of an OLED display according to another embodiment of the present invention.
5 is a diagram showing CIE color coordinates of a pixel including red sub-pixel, green sub-pixel and blue sub-pixel.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention and methods of achieving them will be apparent with reference to the embodiments described in detail below with reference to the drawings. However, the present invention is not limited to the embodiments described below, but may be implemented in various forms.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or corresponding components throughout the drawings, and a duplicate description thereof will be omitted .

In the following embodiments, the terms first, second, and the like are used for the purpose of distinguishing one element from another element, not the limitative meaning.

In the following examples, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

In the following embodiments, terms such as inclusive or possessive are intended to mean that a feature, or element, described in the specification is present, and does not preclude the possibility that one or more other features or elements may be added.

In the following embodiments, when a part of a film, an area, a component or the like is on or on another part, not only the case where the part is directly on the other part but also another film, area, And the like.

In the drawings, components may be exaggerated or reduced in size for convenience of explanation. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.

1A schematically shows a planar structure of one pixel 100 of an organic light emitting diode display 1 according to an embodiment of the present invention. The OLED display 1 may correspond to a stripe type.

The OLED display 1 includes a pixel 100 including a first sub-pixel 110, a second sub-pixel 120, a third sub-pixel 130, and a fourth sub-pixel 140; The first sub-pixel 110 includes a first emission layer that emits a first color light, the second sub-pixel 120 includes a second emission layer that emits a second color light, and the third sub- And a third light emitting layer that emits a third color light, and the fourth subpixel 140 includes a fourth light emitting layer that emits a fourth color light; The first color light, the second color light, the third color light and the fourth color light are different from each other; At least one of the first, second, third, and fourth emission layers may emit a delayed fluorescence.

For example, the luminescent layer emitting the retarded fluorescence may simultaneously emit fluorescence, but the present invention is not limited thereto.

The light emitting layer that emits the retarded fluorescent light includes a first material and a second material, and the first material may be a host and the second material may be a dopant. Here, the dopant means a compound emitting light.

For example, the energy gap (? ST (Dopant)) of the dopant may satisfy the following formula 1, but is not limited thereto:

<Formula 1>

_{△ ST (Dopant) = Eg S} (Dopant) - Eg T (Dopant) ≤ 0.3 eV

In the formula 1,

Eg _S (Dopant) is the excited singlet energy of the dopant,

Eg _T (Dopant) is the excited triplet energy of the dopant.

When compounds having a small? ST are used, intersystem crossing may occur even at a low temperature (for example, room temperature). Therefore, as the compound having a small? ST is used, the rate of emitting the delayed fluorescent light can be increased, so that the efficiency of the organic light emitting display device can be improved.

As another example, the energy gap (? ST (Dopant)) of the dopant may satisfy the following formula 1-1, but is not limited thereto:

<Expression 1-1>

0 eV <? ST (Dopant) <0.3 eV.

As another example, the energy gap (? ST (Dopant)) of the dopant may satisfy the following formulas 1-2, but is not limited thereto:

<Expression 1-2>

0 eV <? ST (Dopant) <0.2 eV.

For example, the energy gap (? ST (Host)) of the host may satisfy the following equation 2, but is not limited thereto:

<Formula 2>

? ST (Host) = Eg _S (Host) - Eg _T (Host) < 0.3 eV

In the formula 2,

Eg _S (Host) is the excitation energy of the host,

Eg _T (Host) is the excited triplet energy of the host.

For example, at least one of the excited triplet energy of the host and the excited triplet energy of the host may be higher than at least one of the excited triplet energy of the dopant and the excited triplet energy of the dopant, no.

As another example, the excited triplet energy of the host, excited triplet energy of the host, excited triplet energy of the dopant, and excited triplet energy of the dopant may satisfy Equation 2 or 3, no:

<Formula 2>

Eg _S (Host)> Eg _S (Dopant)

<Formula 3>

Eg _T (Host)> Eg _T (Dopant)

Of the above formulas 2 and 3,

Eg _S (Host) is the excited energy of the host;

Eg _S (Dopant) is the excited singlet energy of the dopant;

Eg _T (Host) is the excitation triplet energy of the host;

Eg _T (Dopant) is the excited triplet energy of the dopant.

For example, the host may have a hole transporting ability and an electron transporting ability, and may be a material that prevents long-wavelength light emission from the light emitting layer containing the host. In addition, the host can have a high glass transition temperature.

As another example, the host may be selected from, but is not limited to, the following compounds:

The content of the host may be 0.1 vol% or more, 1 vol. Or more, 50 vol.% Or less, 20 vol.% Or less, 10 vol.% Or less based on the total volume of the light emitting layer.

For example, the dopant may be a carbazole derivative, a bis-carbazole derivative, an indolocarbazole derivative, an acridine derivative, an oxazine derivative, a pyrazine derivative, a pyrimidine derivative, a triazine derivative, a dibenzofuran derivative, Thiophene derivatives, and the like, and the derivatives may optionally have a substituent. Examples of the substituent include an aryl group having 6 to 40 carbon atoms, a heterocyclic group having 2 to 40 carbon atoms, a trialkylsilyl group, a dialkylarylsilyl group, an alkyldiarylsilyl group, a triarylsilyl group, a fluorine atom, And the like. The trialkylsilyl group, the dialkylarylsilyl group, the alkyldiarylsilyl group and the triarylsilyl group each include at least one substituent selected from an alkyl group having 1 to 30 carbon atoms and an aryl group having 6 to 30 carbon atoms can do. It may also contain a deuterium atom instead of a hydrogen atom.

As another example, the dopant may be at least one selected from the group consisting of a carbazole structure, a bis-carbazole structure, an indolocarbazole structure and an acridine structure, an oxazine structure, a pyrazine structure, a pyrimidine structure, A benzofurane structure, or a benzofuran structure. Here, "coupled" means connecting to any connector, specifically, the connector may be a single bond, a phenylene group or a meta-biphenylene group.

The structure of the carbazole structure, the bis-carbazole structure, the indolocarbazole structure, the acridine structure, the oxazine structure, the pyrazine structure, the pyrimidine structure, the triazine structure, and the dibenzofurane structure Refers to a ring structure containing a carbazole, bis-carbazole, indolocarbazole, acridine, oxazine, pyrazine, pyrimidine, triazine and dibenzofuran as partial structures.

Wherein the carbazole structure, the bis-carbazole structure, the indolacarbazole structure, the acridine structure, the oxazine structure, the pyrazine structure, the pyrimidine structure, the triazine structure, and the dibenzofurane structure are And may optionally contain a substituent. Examples of the substituent include an aryl group having 6 to 40 carbon atoms, a heterocyclic group having 2 to 40 carbon atoms, a trialkylsilyl group, a dialkylarylsilyl group, an alkyldiarylsilyl group, a triarylsilyl group, a fluorine atom, And the like. The trialkylsilyl group, the dialkylarylsilyl group, the alkyldiarylsilyl group and the triarylsilyl group each include at least one substituent selected from an alkyl group having 1 to 30 carbon atoms and an aryl group having 6 to 30 carbon atoms can do. It may also contain a deuterium atom instead of a hydrogen atom.

The dopant may be a combination of a donor element and an acceptor element, and may be a compound represented by any one of the following formulas (101) and (102)

<Formula 101>

Wherein A, B and C independently represent a substituted or unsubstituted 5-membered ring containing at least one member selected from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom and a silicon atom as a ring constituent atom, A ring to 7-membered ring; A, B and C are condensed with each other; C may optionally have other rings condensed.

In the above formulas (101) and (102), Q is selected from monovalent or divalent C ₅ -C ₆₀ arenes and C ₂ -C ₆₀ heteroarenes.

In the above formulas (101) and (102), k is selected from 1 and 2.

In the general formula (102), Ar is a substituted or unsubstituted aromatic hydrocarbon group.

The compounds represented by any one of formulas (101) and (102) may be represented by any one of the following formulas (101A), (101B), (102A)

&Lt; RTI ID = 0.0 > 101B &

&Lt; Formula 102A > < Formula 102B >

A, B, C, Q, Ar and k in the above formulas 101A, 101B, 102A and 102B refer to those defined in the above formulas 101 and 102; D and E are each independently selected from a substituted or unsubstituted 5-membered ring to 7-membered ring containing at least one member selected from a carbon atom, a nitrogen atom, an oxygen atom, a sulfur atom and a silicon atom as ring constituting atoms.

The compound represented by the formula (101) may be represented by any one of the following formulas (101-1) to (101-11), but is not limited thereto:

In the above formulas (101-1) to (101-11), Q is as defined in the above formula (101).

In the general formulas (101-1) to (101-11), R is an alkyl group, X is selected from CH, CR _x , O, S and N, and R _x is a substituent.

In the above formulas (101-2) and (101-6), B _x is selected from a 5-membered ring to 7-membered ring composed of carbon atoms.

The compound represented by Formula 101 may be represented by any one of the following Formulas 101-21 to 101-28, but is not limited thereto:

In Formulas 101-21 to 101-28, Q and Ar are as defined in Formula 101-1, and Ph is a phenyl group.

The compound represented by the formula (102) may be represented by any one of the following formulas (102-1) to (102-6), but is not limited thereto:

In the general formulas (102-1) to (102-6), R is an alkyl group.

In the general formulas (102-1) to (102-6), X and X ₁ to X ₄ are each independently selected from CH, CR _x and N, and R _x is a substituent. Provided that one of X ₁ to X ₄ is a carbon atom bonded to Q.

In the formulas (102-1) to (102-6), Bx is selected from a 5-membered ring to 7-membered ring composed of carbon atoms.

In Formulas 102-1 to 102-6, Ar is an aromatic hydrocarbon group and Ph is a phenyl group.

For example, in the general formulas (102-1) to (102-6), X ₁ or X ₄ may be a carbon atom bonded to Q.

The compound represented by Formula 102 may be selected from the following Formulas 102-11 to 102-20, but is not limited thereto:

In Formulas 102-11 to 102-20, Q represents the same as defined in Formula 102-1, and Ph is a phenyl group.

As another example, the dopant may be selected from, but not limited to, the following compounds:

The first color light, the second color light, the third color light, and the fourth color light may be combined with each other to become white light.

The organic metal compound may be included only in one of the first to fourth emission layers. For example, the organic metal compound may be included only in the fourth light emitting layer, but is not limited thereto.

For example, the first color light is red light, the second color light is green light, the third color light is blue light, and the fourth color light is selected among yellow light, cyan color light, and magenta color light But is not limited thereto.

As another example, the fourth color light may be yellow light or cyan color light, but is not limited thereto.

As another example, the fourth color light may be delayed fluorescent light, and may be yellow, cyan, or magenta, but is not limited thereto.

As another example, the fourth color light may be delayed fluorescent light, and may be yellow or cyan, but is not limited thereto.

The maximum emission wavelength of the yellow light may be 500 nm to 740 nm, but is not limited thereto. The maximum emission wavelength of the cyan light may be from 445 nm to 560 nm, but is not limited thereto. The emission wavelength of the magenta light may be 445 nm to 485 nm and 625 nm to 740 nm, but is not limited thereto.

The maximum emission wavelength of the red light may be 580 nm to 700 nm, but is not limited thereto. The maximum emission wavelength of the green light may be 500 nm to 600 nm, but is not limited thereto. The maximum emission wavelength of the blue light may be 400 nm to 500 nm, but is not limited thereto.

The area of the first sub-pixel 110, the area of the second sub-pixel 120, the area of the third sub-pixel 130, and the area of the fourth sub-pixel 140 may be equal to or different from each other, It is not.

The first subpixel 110, the second subpixel 120, the third subpixel 130, and the fourth subpixel 140 are sequentially arranged in FIG. 1A. However, the present invention is not limited thereto. For example, the first sub-pixel 110 and the fourth sub-pixel 140 may be disposed adjacent to each other, or the second sub-pixel 120 and the fourth sub-pixel 140 may be disposed adjacent to each other, The third sub-pixel 130 and the fourth sub-pixel 140 may be disposed adjacent to each other.

1B schematically shows a planar structure of one pixel 100 of the OLED display 1 according to an embodiment of the present invention. The OLED display 1 may correspond to a stripe type. Specifically, the organic light emitting display according to FIG. 1B corresponds to the case where the organic light emitting display according to FIG. 1A further includes one sub-pixel.

The pixel 100 may further include a fifth sub-pixel 150. The fifth sub-pixel 150 includes a fifth emissive layer that emits a fifth color light, and the fifth color light is emitted from one of the first color light, the second color light, the third color light, and the fourth color light They may be the same or different from each other, but are not limited thereto.

2 schematically shows a cross-sectional structure of one pixel of the organic light emitting diode display 2 according to an embodiment of the present invention.

The OLED display 2 may include a first subpixel 210, a second subpixel 220, a third subpixel 230, and a fourth subpixel 240.

 The OLED display 2 includes a substrate 200 including a first sub-pixel region 201, a second sub-pixel region 202, a third sub-pixel region 203 and a fourth sub-pixel region 204, . &Lt; / RTI &gt;

The substrate 200 may be a glass substrate or a transparent plastic substrate having excellent mechanical strength, thermal stability, transparency, surface smoothness, ease of handling, and waterproofness.

The first sub-pixel 210 is disposed in the first sub-pixel region 201, the second sub-pixel 220 is disposed in the second sub-pixel region 202, the third sub-pixel 230 is disposed in the third sub- Pixel region 203 and the fourth sub-pixel 240 may be disposed in the fourth sub-pixel region 204. The fourth sub-

The first sub-pixel 210, the second sub-pixel 220, the third sub-pixel 230 and the fourth sub-pixel 240 are connected to the first electrodes 211, 221, 231, Second electrodes 213, 223, 233, and 243 opposed to the second electrodes 211, 221, 231, and 241, respectively.

The first electrodes 211, 221, 231, and 241 may be formed, for example, on the substrate 200 by providing a first electrode material using a deposition method, a sputtering method, or the like. When the first electrodes 211, 221, 231, and 241 are the anode, the first electrode material may be selected from materials having a high work function to facilitate hole injection. The first electrodes 211, 221, 231, and 241 may be reflective electrodes, transflective electrodes, or transmissive electrodes. As the material for the first electrode, indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO ₂ ), zinc oxide (ZnO) and the like which are transparent and excellent in conductivity can be used. (Mg), aluminum (Al), aluminum-lithium (Al-Si), or the like is used as the first electrode material in order to form the first electrodes 211, 221, 231, Li), calcium (Ca), magnesium-indium (Mg-In), and magnesium-silver (Mg-Ag).

The first electrodes 211, 221, 231, and 241 may have a single layer or a multilayer structure having a plurality of layers. For example, the first electrodes 211, 221, 231, and 241 may have a three-layer structure of ITO / Ag / ITO, but the present invention is not limited thereto.

The second electrodes 213, 223, 233 and 243 may be a cathode, which is an electron injection electrode. At this time, the second electrode material may be a metal, an alloy, an electrically conductive compound having a low work function, Mixtures may be used. Specific examples of the material for the second electrode include lithium, magnesium, aluminum, aluminum-lithium, calcium, magnesium-magnesium, Silver (Mg-Ag), and the like. Alternatively, ITO or IZO may be used as the second electrode material. The second electrodes 213, 223, 233, and 243 may be a reflective electrode, a transflective electrode, or a transmissive electrode.

Organic layers 218, 228, 238, and 248 may be disposed between the first electrodes 211, 221, 231, and 241 and the second electrodes 213, 223, 233, and 243.

The first subpixel 210 includes a first emission layer 212 that emits a first color light and the second subpixel 220 includes a second emission layer 222 that emits a second color light. The subpixel 230 includes a third emission layer 232 that emits a third color light and the fourth subpixel 240 includes a fourth emission layer 242 that emits a fourth color light.

The organic layers 218, 228, 238 and 248 may further include a hole transporting region interposed between the first electrodes 211, 221, 231 and 241 and the light emitting layers 212, 222, 232 and 242. The organic layers 218, 228, 238 and 248 may further include an electron transporting region interposed between the light emitting layers 212, 222, 232 and 242 and the second electrodes 213, 223, 233 and 243.

3 schematically shows a planar structure of one pixel 300 of the OLED display 3 according to another embodiment of the present invention. The OLED display 3 may correspond to a rectangular type.

The OLED display 3 includes a pixel 300 including a first subpixel 310, a second subpixel 320, a third subpixel 330, and a fourth subpixel 340; The first sub-pixel 310 includes a first emission layer that emits a first color light, the second sub-pixel 320 includes a second emission layer that emits a second color light, and the third sub-pixel 330 includes a first emission layer And a third light emitting layer for emitting a third color light, and the fourth sub-pixel 340 includes a fourth light emitting layer for emitting a fourth color light; The first color light, the second color light, the third color light and the fourth color light are different from each other; At least one of the first, second, third, and fourth emission layers may emit a delayed fluorescence.

The first color light, the second color light, the third color light, and the fourth color light may be combined with each other to become white light.

The organic metal compound may be included only in one of the first to fourth emission layers. For example, the organic metal compound may be included only in the fourth light emitting layer, but is not limited thereto.

For example, the first color light is red light, the second color light is green light, the third color light is blue light, and the fourth color light is selected among yellow light, cyan color light, and magenta color light But is not limited thereto.

As another example, the fourth color light may be yellow light or cyan color light, but is not limited thereto.

As another example, the fourth color light may be delayed fluorescent light, and may be yellow, cyan, or magenta, but is not limited thereto.

As another example, the fourth color light may be delayed fluorescent light, and may be yellow or cyan, but is not limited thereto.

The maximum emission wavelength of the yellow light may be 500 nm to 740 nm, but is not limited thereto. The maximum emission wavelength of the cyan light may be from 445 nm to 560 nm, but is not limited thereto. The emission wavelength of the magenta light may be 445 nm to 485 nm and 625 nm to 740 nm, but is not limited thereto.

The maximum emission wavelength of the red light may be 580 nm to 700 nm, but is not limited thereto. The maximum emission wavelength of the green light may be 500 nm to 600 nm, but is not limited thereto. The maximum emission wavelength of the blue light may be 400 nm to 500 nm, but is not limited thereto.

At least one of the external quantum efficiency of the first subpixel 310, the external quantum efficiency of the second subpixel 320, the external quantum efficiency of the third subpixel 330, and the external quantum efficiency of the fourth subpixel 340 May be greater than 20% to 100%, but is not so limited.

The area of the first sub-pixel 310, the area of the second sub-pixel 320, the area of the third sub-pixel 330, and the area of the fourth sub-pixel 340 may be equal to or different from each other, It is not.

3, the first sub-pixel 310 is disposed adjacent to the second sub-pixel 320 and the third sub-pixel 330, and the second sub-pixel 320 is disposed adjacent to the first sub-pixel 310 and the fourth sub- Pixel 330 is disposed adjacent to the first sub-pixel 310 and the fourth sub-pixel 340 and the fourth sub-pixel 340 is disposed adjacent to the second sub-pixel 340. The third sub- Pixel 320 and the third sub-pixel 330, but the present invention is not limited thereto. For example, the first sub-pixel 310 and the fourth sub-pixel 340 may be disposed adjacent to each other.

The pixel 300 may further include a fifth sub-pixel. The fifth sub-pixel includes a fifth emission layer emitting a fifth color light, and the fifth color light is equal to either one of the first color light, the second color light, the third color light, and the fourth color light But they are not limited thereto.

4 schematically shows a planar structure of one pixel 400 of the OLED display 4 according to another embodiment of the present invention. The organic light emitting diode display 4 may correspond to a penta type.

The OLED display 4 includes a pixel 400 including a first subpixel 410, a second subpixel 420, a third subpixel 430, and a fourth subpixel 440; The first sub-pixel 410 includes a first emission layer that emits a first color light, the second sub-pixel 420 includes a second emission layer that emits a second color light, and the third sub-pixel 430 includes a first emission layer And a third emission layer that emits a third color light, and the fourth subpixel 440 includes a fourth emission layer that emits a fourth color light; The first color light, the second color light, the third color light and the fourth color light are different from each other; At least one light-emitting layer of the first light-emitting layer, the second light-emitting layer, the third light-emitting layer, and the fourth light-emitting layer may include the organometallic compound represented by Formula 1.

The first color light, the second color light, the third color light, and the fourth color light may be combined with each other to become white light.

The organic metal compound may be included only in one of the first to fourth emission layers. For example, the organic metal compound may be included only in the fourth light emitting layer, but is not limited thereto.

For example, the first color light is red light, the second color light is green light, the third color light is blue light, and the fourth color light is selected among yellow light, cyan color light, and magenta color light But is not limited thereto.

As another example, the fourth color light may be yellow light or cyan color light, but is not limited thereto.

As another example, the fourth color light may be delayed fluorescent light, and may be yellow, cyan, or magenta, but is not limited thereto.

As another example, the fourth color light may be delayed fluorescent light, and may be yellow or cyan, but is not limited thereto.

The maximum emission wavelength of the yellow light may be 500 nm to 740 nm, but is not limited thereto. The maximum emission wavelength of the cyan light may be from 445 nm to 560 nm, but is not limited thereto. The emission wavelength of the magenta light may be 445 nm to 485 nm and 625 nm to 740 nm, but is not limited thereto.

The maximum emission wavelength of the red light may be 580 nm to 700 nm, but is not limited thereto. The maximum emission wavelength of the green light may be 500 nm to 600 nm, but is not limited thereto. The maximum emission wavelength of the blue light may be 400 nm to 500 nm, but is not limited thereto.

At least one of the external quantum efficiency of the first subpixel 410, the external quantum efficiency of the second subpixel 420, the external quantum efficiency of the third subpixel 430, and the external quantum efficiency of the fourth subpixel 440 May be greater than 20% to 100%, but is not so limited.

The area of the first sub-pixel 410, the area of the second sub-pixel 420, the area of the third sub-pixel 430, and the area of the fourth sub-pixel 440 may be the same or different, It is not.

4, the first subpixel 410 is disposed adjacent to the second subpixel 420 and the third subpixel 430, and the second subpixel 420 is disposed adjacent to the first subpixel 410 and the fourth subpixel 430, Pixel 430 is disposed adjacent to the first subpixel 410 and the fourth subpixel 440 and the fourth subpixel 440 is disposed adjacent to the second subpixel 440. The third subpixel 430 is disposed adjacent to the first subpixel 410 and the fourth subpixel 440, Pixel 420 and the third sub-pixel 430, but the present invention is not limited thereto. For example, the first subpixel 410 and the fourth subpixel 440 may be disposed adjacent to each other.

The pixel 400 may further include a fifth sub-pixel. The fifth sub-pixel includes a fifth emission layer emitting a fifth color light, and the fifth color light is equal to either one of the first color light, the second color light, the third color light, and the fourth color light But they are not limited thereto.

The organic light emitting display device has been described with reference to FIGS. 1 to 4, but the present invention is not limited thereto.

The first color light, the second color light, the third color light, and the fourth color light form a convex polygon including white in the CIE color coordinates;

The two color lights selected from the first color light, the second color light, the third color light and the fourth color light may be in a complementary color light relationship.

As a standard standard of a color gamut that indicates a color reproduction range, there is, for example, an NTSC (National Television System Committee) method. A method of defining the NTSC color gamut 100% will be described with reference to FIG. In Fig. 5, CIE color coordinates of red, green and blue are displayed. The red CIE color coordinates may be (0.67, 0.33), the green CIE color coordinates may be (0.21, 0.71), the blue CIE color coordinates may be (0.14, 0.08), and the white CIE color coordinates may be (0.31, 0.316). In FIG. 5, the area of the triangle surrounded by CIE color coordinates of red, green, and blue is defined as 100% of the NTSC color gamut. Widening the color gamut of the OLED display means that the color gamut of the display device is close to 100% of the NTSC color gamut.

Therefore, in order to widen the color gamut of the OLED display device, the organic EL display device further includes a sub-pixel which emits colors located outside the color regions defined by red, green and blue, in addition to the red sub-pixel, the green sub-pixel and the blue sub- .

At this time, the sub-pixels emitting colors located outside the color regions defined by red, green and blue can be improved in efficiency as compared with the organic light emitting display including sub-pixels emitting only fluorescence by emitting delayed fluorescent light. In addition, the life span of the organic light emitting display device including the sub-pixel that emits phosphorescence can be improved. Therefore, the organic light emitting display device can exhibit characteristics of high color purity, low power consumption, and long life.

Hereinafter, an OLED display according to an embodiment of the present invention will be described in detail with reference to embodiments.

 [Example]

Evaluation example  1: CD1 Energy gap  Measure

The lowest excitation energy (E _S1 ) and the lowest excitation triplet energy (E _T1 ) of the following compound CD1 are measured according to the following method, and then the difference between E _S1 and E _T1 is calculated, (? ST) was determined. The results are shown in Table 1 below.

(1) Measurement of the lowest excitation energy (E _S1 ) of CD1

CD1 was deposited on the Si substrate to a thickness of 100 nm and then a 337 nm nitrogen laser (MNL200, Lasertechnik Berlin) was used as an excitation light source and a streak camera (C4334 manufactured by HAMAMATSU) was used as a detector. The spectrum was measured. The x-axis of the fluorescence spectrum was set as a wavelength, and the y-axis was set as an emission intensity. A straight line most similar to the graph on the short wavelength side of the fluorescence spectrum was drawn and the x-intercept value of the straight line was determined as lambda _edge . and E _S1 is determined by substituting λ _edge into the following formula A.

<Formula A>

E _S1 (eV) = 1239.85 / _λedge

(2) the lowest excitation triplet energy (E _T1 ) of CD1,

CD1 was deposited on the Si substrate to a thickness of 100 nm and then a 337 nm nitrogen laser (MNL200 from Lasertechnik Berlin) was used as an excitation light source and a streak camera (C4334 from HAMAMATSU) was used as a detector. The spectrum was measured. The x-axis of the phosphorescence spectrum was set as the wavelength, and the y-axis was set as the emission intensity. A straight line most similar to the graph on the short wavelength side of the phosphorescence spectrum was drawn and the x-intercept value of the straight line was determined as lambda _edge . E _edge is substituted into the following expression B to determine E _T1 .

<Formula B>

E _T1 (eV) = 1239.85 / _λedge

(3) Calculation of energy gap (? ST) of CD1

E _S1 and E _T1 obtained in the equations (1) and (2) were substituted into the following formula C to calculate? ST.

<Formula C>

△ ST = E _T1 - E _S1

E _{S1 of} CD1 E _{T1 of} CD1 △ ST of CD1 2.9 eV 3.0 eV 0.1 eV

Evaluation example  2: YD1 Energy gap  Measure

ES1, ET1 and energy gap (? ST) of YD1 were determined using the same method as in Example 1, except that the compound CD1 was changed to the following compound YD1. The results are shown in Table 2 below.

E _{S1 of} YD1 E _{T1 of} YD1 YD1 △ ST 2.3 eV 2.23 eV 0.07 eV

Example  One

An organic light emitting display including a pixel having the structure as shown in Fig. 1 was fabricated according to the method described below.

A TFT is formed on a glass substrate, a planarizing film is formed on the TFT using polyimide resin, Ag is patterned to a thickness of 100 nm, and ITO is patterned to a thickness of 20 nm on the Ag. Thereby forming a first electrode. A pixel defining layer was formed on the first electrode using a polyimide resin. The glass substrate was ultrasonically cleaned with isopropyl alcohol, irradiated with ultraviolet rays for 30 minutes, exposed to ozone and cleaned, and the glass substrate was placed in a vacuum deposition apparatus.

Compound HT1 was deposited on the glass substrate to form a hole injection layer having a thickness of 75 nm as a common layer. Compound HT2 was deposited to form a first subpixel hole transport layer having a thickness of 50 nm, a second subpixel hole transport layer having a thickness of 30 nm, A third sub pixel hole transport layer having a thickness of 20 nm and a fourth sub pixel hole transport layer having a thickness of 25 nm were formed as a common layer.

A first sub pixel emission layer (red) having a thickness of 60 nm, CBP and GD1 were co-deposited on the hole transport layer at a volume ratio of 92: 8 by co-deposition of CBP and RD1 at a volume ratio of 99: A third sub pixel emission layer (blue) having a thickness of 20 nm and co-deposited with CH1 and CD1 at a volume ratio of 95: 5 were co-deposited with a pixel emission layer (green), BH1 and BD1 at a volume ratio of 95: A pixel-emission layer (cyan) was formed.

ET1 was deposited on the light emitting layer to form an electron transporting layer having a thickness of 10 nm as a common layer. ET2 and Liq were co-deposited on the electron transport layer at a volume ratio of 50:50 to form an electron injection layer with a thickness of 20 nm as a common layer.

Mg and Ag were co-deposited on the electron injection layer at a volume ratio of 80:20 to form a second electrode having a thickness of 12 nm. Thus, an organic light emitting display device was fabricated.

　　　　　　　

　　　　　　　

Example  2

Except that YH1 was used in place of CH1 and YD1 was used in place of CD1 to form a fourth sub pixel emission layer (yellow) having a thickness of 50 nm, an organic light emitting display device Respectively.

Comparative Example 1

An organic light emitting display was manufactured using the same method as in Example 1, except that the fourth sub-pixel was not formed.

Comparative Example 2

Except that CBP was used in place of CH1 and FIrpic was used in place of CD1 to form a 25 nm thick fourth sub pixel emission layer (cyan) on the organic light emitting display device Respectively.

Comparative Example 3

Except that ADN was used in place of CH1 and DPAVBi was used in place of CD1 to form a 25 nm thick fourth sub pixel emission layer (cyan) on the organic light emitting display device Respectively.

Evaluation example  3

The color coordinates, efficiency and white power (0.310, 0.316) of the organic light emitting display manufactured in Examples 1 and 2 and Comparative Examples 1 to 3 were measured at 100 cd / m &lt; ² &gt; 7 (the results of Example 1 are shown in Table 3, the results of Example 2 are shown in Table 4, the results of Comparative Example 1 are shown in Table 5, the results of Comparative Example 2 Are shown in Table 6, and the results of Comparative Example 3 are shown in Table 7). At this time, the power consumption was based on the aperture ratio of 50% and the driving voltage of 10 V, and the lifetime was measured as the time taken for the luminance to become 90% of the initial luminance.

Subpixel Color coordinates efficiency
(cd / A) 100 nit, NTSC (0.310, 0.316) CIE_x CIE_y Luminance ratio Power (mW) Life span (h) Red 0.650 0.348 21.2 0.36 135 140 green 0.260 0.658 32.4 0.21 blue 0.136 0.108 2.5 0.00 Cyan 0.120 0.235 15.8 0.42

Subpixel Color coordinates efficiency
(cd / A) 100 nit, NTSC (0.310, 0.316) CIE_x CIE_y Luminance ratio Power (mW) Life span (h) Red 0.650 0.348 21.2 0.00 249 130 green 0.260 0.658 32.4 0.15 blue 0.136 0.108 2.5 0.14 yellow 0.450 0.427 21.2 0.71

Subpixel Color coordinates efficiency
(cd / A) 100 nit, NTSC (0.310, 0.316) CIE_x CIE_y Luminance ratio Power (mW) Life span (h) Red 0.650 0.348 21.2 0.30 254 120 green 0.260 0.658 32.4 0.54 blue 0.136 0.108 2.5 0.16

Subpixel Color coordinates efficiency
(cd / A) 100 nit, NTSC (0.310, 0.316) CIE_x CIE_y Luminance ratio Power (mW) Life span (h) Red 0.650 0.348 21.2 0.37 136 5 green 0.260 0.658 32.4 0.17 blue 0.136 0.108 2.5 0.00 Cyan 0.123 0.250 16.5 0.46

Subpixel Color coordinates efficiency
(cd / A) 100 nit, NTSC (0.310, 0.316) CIE_x CIE_y Luminance ratio Power (mW) Life span (h) Red 0.650 0.348 21.2 0.32 179 110 green 0.260 0.658 32.4 0.23 blue 0.136 0.108 2.5 0.00 Cyan 0.158 0.239 10.2 0.46

It can be seen from the above Tables 3 to 7 that the organic light emitting display devices of Examples 1 and 2 have lower power consumption and improved lifetime than the organic light emitting display devices of Comparative Examples 1 to 3. In addition, since the organic light emitting display devices of Examples 1 and 2 have higher NTSC color gamut than the organic light emitting display device of Comparative Example 1, the color reproduction rate is high.

1: organic light emitting display
100: pixel
110: first sub-pixel 120: second sub-pixel
130: third subpixel 140: fourth subpixel
2: organic light emitting display
200: substrate
201: first sub-pixel region 202: second sub-pixel region
203: third sub-pixel region 204: fourth sub-pixel region
210: first sub-pixel 212: first light-emitting layer
220: second subpixel 222: second light emitting layer
230: third subpixel 232: third light emitting layer
240: fourth sub-pixel 242: fourth emission layer
211, 221, 231, and 241:
212, 222, 232, 242: light emitting layer
213, 223, 233, 243:
218, 228, 238, 248:
3: organic light emitting display
300: pixel
310: first sub-pixel 320: second sub-pixel
330: third sub-pixel 340: fourth sub-pixel
4: organic light emitting display
400: pixel
410: first sub-pixel 420: second sub-pixel
430: third subpixel 440: fourth subpixel

Claims (20)

A first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel; ;
The first sub-pixel includes a first light emitting layer that emits a first color light, the second sub-pixel includes a second light emitting layer that emits a second color light, and the third sub-pixel emits a third color light Pixel includes a fourth light-emitting layer for emitting a fourth color light;
The first color light, the second color light, the third color light and the fourth color light are different from each other;
Wherein at least one of the first light emitting layer, the second light emitting layer, the third light emitting layer, and the fourth light emitting layer emits a delayed fluorescence. The method according to claim 1,
Wherein the light emitting layer that emits the retarded fluorescent light also emits fluorescence at the same time. The method according to claim 1,
The luminescent layer emitting the retarded fluorescence includes a host and a dopant,
And the energy gap (? ST (Dopant)) of the dopant satisfies the following formula (1):
<Formula 1>
_{△ ST (Dopant) = Eg S} (Dopant) - Eg T (Dopant) ≤ 0.3 eV
In the formula 1,
Eg _S (Dopant) is the excited singlet energy of the dopant,
Eg _T (Dopant) is the excited triplet energy of the dopant. The method of claim 3,
Wherein an energy gap (? ST (Dopant)) of the dopant satisfies the following formula 1-1:
<Expression 1-1>
0 eV ≤ △ ST (Dopant) <0.3 eV. The method of claim 3,
Wherein an energy gap (? ST (Dopant)) of the dopant satisfies the following formulas 1-2:
<Expression 1-2>
0 eV <? ST (Dopant) <0.2 eV. The method according to claim 1,
The luminescent layer emitting the retarded fluorescence includes a host and a dopant,
Wherein an energy gap (? ST (Host)) of the host satisfies the following formula (2):
<Formula 2>
? ST (Host) = Eg _S (Host) - Eg _T (Host) < 0.3 eV
In the formula 2,
Eg _S (Host) is the excitation energy of the host,
Eg _T (Host) is the excited triplet energy of the host. The method according to claim 1,
The luminescent layer emitting the retarded fluorescence includes a host and a dopant,
Wherein at least one of the excited triplet energy of the host and the excited triplet energy of the host is higher than at least one of the excited triplet energy of the dopant and the excited triplet energy of the dopant. 8. The method of claim 7,
An excited triplet energy of the host, an excited triplet energy of the host, an excited triplet energy of the dopant, and an excitation triplet energy of the dopant satisfy the following formula 2 or 3:
<Formula 2>
Eg _S (Host)> Eg _S (Dopant)
<Formula 3>
Eg _T (Host)> Eg _T (Dopant)
Of the above formulas 2 and 3,
Eg _S (Host) is the excited energy of the host;
Eg _S (Dopant) is the excited singlet energy of the dopant;
Eg _T (Host) is the excitation triplet energy of the host;
Eg _T (Dopant) is the excited triplet energy of the dopant. The method according to claim 1,
The luminescent layer emitting the retarded fluorescence includes a host and a dopant,
Wherein the host is selected from the following compounds:

The method according to claim 1,
The luminescent layer emitting the retarded fluorescence includes a host and a dopant,
Wherein the content of the host is 0.1 vol% or more and 50 vol% or less based on the total volume of the light emitting layer that emits the retardation fluorescent light. The method according to claim 1,
The luminescent layer emitting the retarded fluorescence includes a host and a dopant,
Wherein the dopant is selected from the following compounds:

The method according to claim 1,
Wherein the first color light, the second color light, the third color light, and the fourth color light combine to form white light. The method according to claim 1,
Wherein the first color light is red light, the second color light is green light, the third color light is blue light,
And the fourth color light is selected from yellow light, cyan color light, and magenta color light. The method according to claim 1,
And the fourth color light is yellow light or cyan light. The method according to claim 1,
Wherein the fourth color light is retarded light and is yellow, cyan, or magenta. The method according to claim 1,
And the fourth color light is retarded fluorescent light and is yellow or cyan. The method according to claim 1,
The maximum emission wavelength of the yellow light is 500 nm to 740 nm;
The maximum emission wavelength of the cyan light is from 445 nm to 560 nm;
And the light emission wavelength of the magenta light is from 445 nm to 485 nm and from 625 nm to 740 nm. The method according to claim 1,
Wherein the area of the first sub-pixel, the area of the second sub-pixel, the area of the third sub-pixel, and the area of the fourth sub-pixel are the same or different from each other. The method according to claim 1,
A fifth sub-pixel;
The fifth sub-pixel includes a fifth emission layer that emits a fifth color light;
Wherein the fifth color light is the same as or different from any one of the first color light, the second color light, the third color light and the fourth color light. The method according to claim 1,
Wherein the first sub-pixel, the second sub-pixel, the third sub-pixel and the fourth sub-pixel are arranged in a stripe type, a rectangular type, or a penta type.

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